/*
 * The contents of this web application are subject to the Mozilla Public License Version 
 * 1.1 (the "License"); you may not use this web application except in compliance with 
 * the License. You may obtain a copy of the License at http://www.mozilla.org/MPL/.
 * 
 * Software distributed under the License is distributed on an "AS IS" basis, 
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 
 * for the specific language governing rights and limitations under the License.
 * 
 * The Original Code is owned by and the Initial Developer of the Original Code is 
 * Composite A/S (Danish business reg.no. 21744409). All Rights Reserved
 * 
 * Section 11 of the License is EXPRESSLY amended to include a provision stating 
 * that any dispute, including but not limited to disputes related to the enforcement 
 * of the License, to which Composite A/S as owner of the Original Code, as Initial 
 * Developer or in any other role, becomes a part to shall be governed by Danish law 
 * and be initiated before the Copenhagen City Court ("K�benhavns Byret")            
 */

using Composite.C1Console.Events;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Composite.Tools.PackageCreator.Types
{

	internal static class ItemManagerCache
	{
		private static Dictionary<Type, IPackItemManager> _itemManagerCache = new Dictionary<Type, IPackItemManager>();

		private static object _lock = new object();

		static ItemManagerCache()
		{
			GlobalEventSystemFacade.SubscribeToFlushEvent(OnFlush);
		}

		public static IPackItemManager GetItemManager(Type type)
		{
			if (type == null) throw new ArgumentNullException("type");

			IPackItemManager actionExecutor = null;

			if (_itemManagerCache.TryGetValue(type, out actionExecutor) == false)
			{
				object[] attributes = type.GetCustomAttributes(typeof(ItemManagerAttribute), true);

				if (attributes.Length != 0)
				{
					ItemManagerAttribute attribute = (ItemManagerAttribute)attributes[0];
					if (attribute.Type == null) throw new InvalidOperationException(string.Format("Item manger type can not be null on the action token {0}", type));
					if (typeof(IPackItemManager).IsAssignableFrom(attribute.Type) == false) throw new InvalidOperationException(string.Format("Item manager {0} should implement the interface {1}", attribute.Type, typeof(IPackItemManager)));
					actionExecutor = (IPackItemManager)Activator.CreateInstance(attribute.Type);
				}
				_itemManagerCache.Add(type, actionExecutor);

			}
			return actionExecutor;
		}

		private static void Flush()
		{
			_itemManagerCache = new Dictionary<Type, IPackItemManager>();
		}

		private static void OnFlush(FlushEventArgs args)
		{
			Flush();
		}
	}
}

